DE8710479U1 - Tubular sampling vessel for taking liquid samples - Google Patents

Description

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The innovation relates to a tube-like sampling vessel for taking * liquid samples, for example from containers, canisters, tanks and the like, wherein the sampling vessel has an inlet opening at its lower front end which can be closed by means of a plate-like closure member. I

Such tubular extraction vessels are known per se. They have a valve at the end that can be opened using a cable pull or other rod-like actuating element when the extraction vessel is inserted into the liquid. Fittings are attached to the end of these tubular extraction vessels that are fixed using rod-like tension elements that are parallel to the axis and are arranged on the outside of the vessel. Such previously known extraction vessels are very complex in construction, which is why they are expensive. Furthermore, the complicated construction makes cleaning the extraction vessel, which is necessary after every operational use, more difficult.

This is where the innovation comes in, which aims to make such tubular extraction vessels more simple in terms of construction and yet still make them easier to handle. According to the innovation, this is achieved by the plate-like closure element being held in its closed position in the empty tubular extraction vessel by its own weight.

Further advantageous embodiments of the innovative proposal are explained using the drawing. They show:

Fig. 1 shows a view of a tubular extraction vessel; Fig. 2 shows a view of a tubular extraction vessel, with individual parts shown in the manner of an exploded drawing and partly cut away;

Fig. 3 illustrates in the form of an exploded view and in a hatchet bar that is enlarged compared to Figs. 1 and 2 the plate-like closure element and the parts interacting with it;

Fig. 4 is a side view of the component which serves to guide the shaft of the closure member;

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Fig _. 5 and Fig. 6 show a view and a side view of the manually operated air pump

f'ig* 7 illustrates an accessory}

Fig* 8 a cup-like closure and

Fig. 9 shows schematically a process during the operational use of the tubular sampling vessel ₄

The tubular extraction vessel 1, which can be several meters long, consists of individual pipe sections 2 of the same dimensions, whereby each of these pipe sections 2 has an internal thread at its end and an external thread 4 at the other end. These threads are formed in a corresponding manner to one another. This tubular extraction vessel 1 has an inlet opening 5 at its lower end, which can be closed by means of a plate-like closure element 6, which expediently has an O-ring 7 as a sealing ring, whereby this plate-like closure element 6 is held in the closed position by its own weight when the extraction vessel is empty.

This plate-like closure member 6 has a central shaft 8 which projects into the interior of the pipe and is guided in an axially displaceable manner in a bushing 9 arranged centrally in the extraction vessel 1. This bushing 9 is supported by a beam 10 which passes transversely through the tubular extraction vessel 1 and which in turn is connected to a ring 12 having an external thread 11. This ring 12 is screwed into a bushing 14 having an internal thread 13, which has on its front side 30 the inlet opening 5 which can be closed by the closure member 6.

The central shaft 8 has a thread 15 on its end on the closure member side, onto which the plate-like closure member 6 is screwed, which rests on a lock nut Λ6 on the tube side. The section of the shaft 8 having the thread 15 also projects slightly from the front side 30 of the bushing 14 when the inlet opening 5 is closed, the axial dimension of this projecting section being adjustable via the lock nut 16.

Furthermore, a scraper ring 17 is pushed onto the outside of the tubular extraction vessel 1, for example in the form of a shaft seal.

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In the internal thread 3 of the end of the tubular withdrawal vessel 1 facing away from the inlet opening 5 there is also a screw-on closure plug 18 which in turn is connected to a manually operated air pump 20, for example in the form of a ball bellows, whereby this air pump 20 has a relief valve 19 which can also be operated manually. Even finer cup-like caps 21 are also available, for example made of a robust and durable plastic, which can be put on the ends of the pipe sections 2.

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14 is only a fraction of the length of a pipe section 2. The internal thread 1.3 of the sleeve 14 accommodates both the external thread 11 of the ring 12 and the external thread 4 of the last pipe section 2 in the sequence of the tubular withdrawal vessel.

Fig. 7 illustrates another accessory in the form of an elongated rod 22, which has a rubber-elastic sleeve 23 at one end, which lies between two pressure plates 24 and 25, whereby the axial pressure on the sleeve 23 can be changed by turning the adjacent nuts 26 and/or 27, so that the diameter of the sleeve 23 can be adjusted at least within a limited range. The other end of the rod 22 is bent by a double bend 28, so that a switching or actuating pin 29 is obtained parallel to the rod 22, the function of which will be discussed in more detail below.

So much for the basic structure. If a sample of a liquid is to be taken from a container, individual pipe sections 2 are screwed together to form a pipe-like sampling vessel 1 of the required length. The scraper ring 17 is at the upper end, and in the sleeve 34 the inlet opening 5 is initially closed by the closure member 6. The sampling vessel prepared in this way is now immersed with the sleeve 14 in front into the liquid to be tested, whereby the static pressure acting on the front side 30 of the sleeve 14 and increasing with increasing immersion depth raises the closure member 6 so that the liquid to be tested can flow into the interior of the sampling vessel via the inlet opening 5. If the static pressure is not sufficient to raise the closure member 6 to release the

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Inlet opening 5* α the closure member 6 is raised by immersing the sampling vessel to the bottom of the container, whereupon the closure member 6 is lifted from its sealing seat via the section of the shaft 8 protruding opposite the support side 13 of the bushing 14 (see Fig. 1), so that the inlet opening 5 is free.

The sample quantity taken is transferred to a prepared test or storage container 31. For this purpose, the lower end of the tubular receiving vessel 1 is introduced into this container 31, simultaneously with the accessory part according to Fig. 7, whereby the closure member can be raised with the shoulder or actuating pin 29 so that the sample quantity taken can flow out into the container 31 (see Fig. 9).

If the tubular sampling vessel is withdrawn when taking a sample from the container, tank or canister containing the liquid to be tested, the scraper ring 17 is held in place and the tubular sampling vessel 1 is pulled through this scraper ring 17* so that the sampling vessel is cleaned at least on its outside.

After each sample has been taken, the individual parts must be cleaned, which in this case is possible without much effort, since the sampling vessel can be dismantled into its individual parts. The rod 22 with its adjustable-diameter sleeve 23 is used to clean the inside of the pipe section 2. This sleeve is inserted into the pipe section like a piston and pushed through the pipe section.

If it is intended that a liquid sample must be ^taken from a container at a predetermined depth, the sealing plug 18 is first tightly screwed onto the upper free end of the tubular sampling vessel 1 using the air pump 20. The air pump 20 is then operated manually and a corresponding air pressure is built up inside the receiving vessel 1, by means of which the sealing element 6 is held in place on its sealing seat. Once the internal pressure thus generated has increased accordingly, the sampling vessel 1 is immersed in the liquid to be tested until the inlet opening *? has reached the required level. The sampling tube is now vented by operating the relief valve 19 and the static pressure of the liquid

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The column now has the option of lifting the closure member 6 and releasing the inlet opening 5. The following procedure is as already explained above.

To protect the threads at the ends of the pipe sections Z and also to close off pipe sections that may not have been completely cleaned, cup-like caps 21 can be provided which are placed over the pipe ends. These cup-like caps are preferably made of a flexible and durable plastic material.

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Legend to the reference numbers

1 tubular sampling vessel 17 Scraper ring 2 Pipe sections 18 Closure plug 3 inner thread 19 Relief valve 4 External thread 20 Air pump 5 Inlet opening 21 Cap 6 Locking link 22 Rod 7 O-ring 23 cuff 8th shaft 24 printing plate 9 Cuchse 25 printing plate 10 Holm 26 Mother 11 thread 27 Mother 12 ring 28 Bending 13 inner thread 29 Switch or actuating pin 14 rifle 30 Front side 15 thread 31 container 16 Lock nut

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Claims (10)

Protection claims: 1. Tubular sampling vessel for taking liquid samples, for example from containers, canisters, tanks and the like, the sampling barrel having an inlet opening (5) at its lower front end (30) which can be closed by means of a plate-like closure member (6), characterized in that the plate-like closure member (6) is held in its closed position in the empty tubular sampling vessel (1) by its own weight. 2. Tube-like withdrawal vessel according to claim 1, characterized in that the plate-like closure member (6) has a central shaft (8) which is directed into the interior of the tube and which is guided axially displaceably in a bushing (9) arranged centrally in the tube. 3. Tubular extraction vessel according to claim 2, characterized in that the bushing (9) is carried by a beam (10) which passes transversely through the tube, which is connected integrally to a ring (12) having an external thread (11), and this ring (12) is screwed into a bushing (14) having an internal thread (13), and this bushing (14) has the inlet opening (5) which can be closed by the plate-like closure member (6). 4. Tubular extraction vessel according to claim 2, characterized in that the central shaft (8) has a thread (15) on its end on the closure member side, onto which the plate-like closure member (6) is screwed, which rests on a lock nut (16) on the tube side and the section of the shaft (8) having the thread (13) protrudes slightly from the end face (30) of the sleeve (14) when the inlet opening (5) is closed. 5. Tubular extraction vessel according to one of claims 1 to 4, characterized in that it consists of several essentially equally long individual pipe sections (2) of the same shape, the individual pipe sections (2) each having an internal thread (3) at one end and an external thread (4) at the other end. £ 6. Tubular extraction vessel according to one of claims 1 to 5, characterized in that Y is characterized in that it has an outer scraper ring (17), for example in the form of a Siramer ring. 7. Tubular extraction vessel according to one of claims 1 to 5, characterized in that a closure plug (18) can be screwed into the internal thread (3) of the end facing away from the inlet opening (5), which in turn carries a manually operable air pump (20) having a relief valve (19), for example in the form of a ball bellows. 8. Tubular extraction vessel according to one of claims 1 to b, characterized in ,i indicates that for closing the threaded openings of the pipe i pieces (2) cup-like caps (21) are provided. \ 9. Tubular withdrawal vessel according to claim 3, characterized in that the axial length of the bushing (14) is only a fraction of the axial length of a pipe section (2). . 10. Tubular extraction vessel according to claim 3, characterized in that ■ the axial length of the internal thread (13) of the sleeve (14) is at least t- sum of the axial lengths of the external thread (11) of the ring (12) and the '[ end external thread (4) of a pipe section (2).